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Dynamic multi-star star chart simulator based on digital micromirror device (DMD) and simulation method thereof

A simulator and star map technology, applied in the space field, can solve the problems of unsatisfactory dynamic image performance, expensive star simulator, poor star display accuracy, etc., to achieve improved total light efficiency, stable picture quality, and excellent uniformity. Effect

Inactive Publication Date: 2011-09-07
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Almost all of these traditional star simulators use liquid crystal light valves, because liquid crystal light valves have the following disadvantages: the response time is relatively long, so the performance in dynamic images is not ideal; the contrast is poor, the star magnitude display accuracy is poor, the simulation The magnitude range is small; the display screen is relatively fragile and easily damaged, which increases the difficulty of using and maintaining the star simulator; it is difficult to make it bigger in terms of technology (mainly because the yield of large screens is low), so the star simulator is expensive
Since D / A conversion is performed before video display, noise is added to the system and the signal-to-noise ratio is reduced.

Method used

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  • Dynamic multi-star star chart simulator based on digital micromirror device (DMD) and simulation method thereof
  • Dynamic multi-star star chart simulator based on digital micromirror device (DMD) and simulation method thereof
  • Dynamic multi-star star chart simulator based on digital micromirror device (DMD) and simulation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Example 1: Combining figure 2 , image 3 , a kind of DMD-based dynamic multi-star map simulator of the present invention, it is made up of data processing unit, DMD drive and processing unit, DMD unit, lens unit and color wheel unit, and data processing unit connects DMD drive and processing unit respectively and the color wheel unit, the DMD drive and processing unit are connected to the DMD unit, and the DMD unit is respectively connected to the lens unit and the color wheel unit. A simulation method implemented by a DMD-based dynamic multi-star map simulator has two working modes: open-loop mode and closed-loop mode;

[0017]In the open-loop mode, the star sensor optical test, circuit test and algorithm test are mainly tested; the star map controller calculates the initial orbital parameters of the aircraft, the initial three-axis attitude in the orbital coordinate system of the aircraft, and the angular velocity of the aircraft attitude at any time. Aircraft orbi...

Embodiment 2

[0019] Example 2: Combining Figure 2-Figure 7 , the main performance indicators of a DMD-based dynamic multi-star map simulator according to the present invention: display field of view: 16°×12°, display star map size: 1920×1080, spectral range: visible light band 0.42 μm-0.75 μm; selected DMD chip size: 6.45μm×6.45μm, contrast ratio: 6000:1, simulated magnitude: 0-9, image display refresh rate: 50-80Hz;

[0020] Using a certain type of star sensor to shoot the star map generated by the star simulator is as follows: Figure 5 , use the star sensor to shoot the star map generated by the LCD-based dynamic multi-star simulator as shown in Figure 4 .

[0021] Since the DMD-based dynamic multi-star map simulator uses digital technology, the input signal can be directly modulated to generate a star map without digital-to-analog conversion. Therefore, after the intermediate processing links of the signal are reduced, the attenuation of the star map signal will be reduced. Natura...

Embodiment 3

[0022] Example 3: Binding Figure 6 , the present invention adopts the single-chip DMD type dynamic multi-star map simulator, including a color wheel, which is divided into three regions of red, green and blue. When working, the disc rotates at a high speed. With the help of the time-sharing formula, the light passing through the turntable will be divided into red, green and blue three-color light, and then reflected to the DMD that operates according to the time-sharing formula, and finally projected onto the The star map of the star sensor can reach up to tens of millions of colors. Obviously, the color reproduction quality of this system depends mainly on the performance of the color wheel. Because the single-chip DMD-style reality system provides high-contrast, high-resolution, and brilliant star map effects, and the DMD-based dynamic multi-star map simulator has a relatively small appearance, light weight, and low power consumption. The core part of the simulator includ...

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Abstract

The invention provides a dynamic multi-star star chart simulator based on a digital micromirror device (DMD) and a simulation method thereof. The simulator consists of a data processing unit, a DMD driving and processing unit, a DMD unit, a camera lens unit and a color wheel unit; the data processing unit is connected with the DMD driving and processing unit and the color wheel unit respectively; the DMD driving and processing unit is connected with the DMD unit; and the DMD unit is connected with the camera lens unit and the color wheel unit respectively. The simulation method is divided into an open loop mode and a closed loop mode; the open loop mode comprises optical testing, circuit testing and algorithm testing of a star sensor; and the closed loop mode comprises system algorithm testing and task running. By adopting an all-digital reflective projection technology, a grey level of an image is improved, the image noise disappears, the picture quality is stable, and the digital image is very precise.

Description

(1) Technical field [0001] The invention relates to space technology, specifically a DMD-based dynamic multi-star map simulator and a simulation method thereof. (2) Background technology [0002] The multi-star simulator (dynamic multi-star simulation) simulates the infinite parallel light image of a certain field of view. Combined with multi-star simulation software, it is mainly used to detect whether the functional indicators such as star sensor imaging, star map recognition, star tracking, and attitude calculation are normal. It can simulate the relative magnitude and angular distance between stars in space to form a star map for detection. The equipped software can have dynamic closed-loop function, which is used for semi-physical simulation test of the system and closed-loop processing of star installation. The main task of the star simulator is to establish the simulated star radiation source used in the ground calibration of the star sensor and the system joint test...

Claims

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Application Information

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IPC IPC(8): G01C25/00
Inventor 李葆华陈希军温奇咏李清华
Owner HARBIN INST OF TECH
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